Gases and vapours other than air can pose a threat to human life. The exact nature of this threat depends on the gas present, but in general we divide gas hazards into three main categories:
â¢ Combustible
â¢ Toxic
â¢ Asphyxiant

Confined spaces contain two types of hazards: atmospheric and physical. About 40% of all confined space incidents involve hazardous atmospheres. For this reason regulators emphasise the requirement to analyse the air for hazardous conditions prior to entry and that spaces be monitored periodically, or in certain situations, continuously, while occupied.

The certification process for gas detection equipment can be complicated in China. Gas detection manufacturers from other major trading blocks around the world will find that exporting products to the Chinese market doesnât follow a similar route to those for European or North American approval, for example. Differences in national standards, and a stringent approval route makes Chinese approval for gas detection products confusing and time-consuming, but not without its economic advantages.

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